Games like Signal Zone
Games like Signal Zone include Thronefall, Frostpunk, They Are Billions, Mindustry, and Until We Die. We matched them by the tags players give Signal Zone on Steam (Strategy, Tower Defense, Base Building, Resource Management, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Thronefall
Shared: Strategy · Tower Defense · Base Building

Frostpunk
Shared: Strategy · Resource Management · Post-apocalyptic

They Are Billions
Shared: Strategy · Base Building · Tower Defense

Mindustry
Shared: Tower Defense · Base Building · Strategy

Until We Die
Shared: Strategy · Base Building · Pixel Graphics

Wall World
Shared: Tower Defense · Strategy · Pixel Graphics

Kingdom Two Crowns
Shared: Tower Defense · Base Building · Strategy

Sheltered
Shared: Base Building · Strategy · Pixel Graphics

Dome Keeper
Shared: Post-apocalyptic · Tower Defense · Resource Management

Factorio
Shared: Base Building · Resource Management · Strategy

Oxygen Not Included
Shared: Base Building · Resource Management · Strategy

Bee Island
Shared: Strategy · Tower Defense · Base Building

Diplomacy is Not an Option
Shared: Resource Management · Base Building · Tower Defense

Tower Dominion
Shared: Strategy · Tower Defense · Base Building

Age of Darkness: Final Stand
Shared: Tower Defense · Strategy · Base Building

This War of Mine
Shared: Strategy · Base Building · Resource Management

Kingdom Rush 6: Genesis TD
Shared: Strategy · Tower Defense · Base Building

From Glory To Goo
Shared: Strategy · Tower Defense · Base Building

Frostpunk 2
Shared: Strategy · Resource Management · Post-apocalyptic

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Tower Defense · Difficult

Minimalist Tower Defense
Shared: Strategy · Tower Defense · Base Building

Rise to Ruins
Shared: Tower Defense · Strategy · Base Building

Bloons TD 6
Shared: Strategy · Tower Defense · Difficult

The King is Watching
Shared: Tower Defense · Base Building · Strategy